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Scala map contains() method with example
  • Last Updated : 28 May, 2019

The contains() method of Scala is equivalent to the isDefinedAt method of Scala but the only difference is that isDefinedAt is observed on all the PartialFunction classes while contains is clearly defined to the Map interface of Scala. It checks whether the stated map contains a binding for a key or not.

  • Method Definition:
    def contains(key: K): Boolean
    

    Where, k is the key.

  • Return Type:
    It returns true if there is a binding for the key in the map stated else returns false.

Example :




// Scala program of contains()
// method
  
// Creating object
object GfG
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating a map
        val map: Map[Int,Int] = Map(2 -> 3)
          
        // Applying contains method
        val result = map.contains(2)
          
        // Displays output
        println(result)
  
    }
}                                         
                                        
Output:
true

Here, contains method has a key identical to the key present in the map stated above so, it returns true.
Example :




// Scala program of contains()
// method
  
// Creating object
object GfG
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating a map
        val map: Map[Int,Int] = Map(4 -> 7)
          
        // Applying contains method
        val result = map.contains(5)
          
        // Displays output
        println(result)
  
    }
Output:
false

Here, contains method has a key which is not identical to the key present in the map stated above so, it returns false.




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